fortification
🇺🇸
/ˌfɔːrtɪfɪˈkeɪʃn/
🇬🇧
/ˌfɔːtɪfɪˈkeɪʃn/
structures built to protect a place from attack
The old fortification walls still stand around the city.
the process of making something stronger
The fortification of the building made it safer during storms.